Gas-furnace for brick-driers.



G. M. RAYMOND & G. R. MUMMA.

GAS FURNACE FOR BRICK DRIERS.

APPLICATION IILED JUNE 18,1914.

1,1 17,905. Patented Nov. 17 1914.

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THE NORRIS PETERS co. PHnmLlTHa. WASHINGTON. D, C.

G. M. RAYMOND & G. R. MUMMA. GAS FURNACE FOR BRICK DRIERS.

APPLICATION FILED JUNE 18. 1914.

1,1 17,905. Patented Nov. 17, 1914.

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Fi .4; 5 a 1441 /5 7 18 Elwwemtoz 5 1m: NORRIS PETERS c0 PHOTU LITHO.. WASHINGTON. Dv C G. M. RAYMOND & G. R. MUMMA.

GAS FURNACE FOR BRICK DRIERS.

Patented NOV. 17, 1914.

APPLICATION FILED JUNE 18.,1914- UNITED STATES PATENT OFFlCE.

GEORGE M. RAYIVIOND AND GEORGE B. MUMMA, OF DAYTON, OHIO, ASSIGNORS TO THE C. W. RAYMOND COMPANY, OF DAYTON, OHIO, A CORPORATION.

GAS-FURNACE FOR BBIOK-DRIERS.

Specification of Letters Patent.

Patented NOV. 17, 1914.

Application filed June 18, 1914. Serial No. 845,846.

To alien/10m it may concern Be it known that we, GEORGE M. Rararown and GEORGE E. MUMMA, citizens of the United States, residing at Dayton, in the county of lilontgomery and State of Ohio, have invented certain new and useful Improvements in Gas-Furnaces for Brick- Driers; and we do declare the following to be a full. clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

' Our invention relates to improvements in gas furnaces for brick driers of a type designed for the use of what is known as producer gas. The improvement may, however, be used for purposes other than driers.

The objects of said invention are to ob tain a saving of fuel which is due to the conversion of a solid fuel-producing element, such as coal, to gas, it being known that gaseous fuel requires less air to produce a satisfactory combustion; and to concentrate the fuel at the desired place, and other advantages such as the labor saved in handling coal and the ashes resulting therefrom.

lVe attain the foregoing objects and purposes. together with other incidental advantages through and by the mechanism and construction illustrated in the accompanying drawings, of which- Figure 1 is a vertical section of "the furnace on the line 11 of Fig. -.l-; Fig. 2 is a vertical section. on the line 22 of Fig. l; Fig. 3 is av section on the line of Fig. 1; F ig. lis a horizontal section on the line 1l of Fig. 1; Fig. 5 is a vertical section on the line 55 of Fig. J5; Fig. 6 is a vertical section on the line 6--6 of Fig. 1: Fig. 7 is a vertical section on the line 77 of Fig. 2; Fig. 8 is a vertical section on the line 88 of Fig. 1; Fig. 9 is a vertical section on the line 9-4) of Fig. 2; and Fig. 10 is a vertical section on the line 101O of Fig. 1.

In the specification and drawings, similar reference characters indicate corresponding parts.

The present invention relates particularly to a furnace which is adaptable to any well known type of driers of the tunnel type. The drier in its entirety may consist of one or a plurality of individual tunnels each of which is provided with a separate furnace. The drier, a portion of which is shown herein, is provided with side or division walls 11 which support cross rails 12 upon which tracks 13 are mounted. The tracks 13 extend through the tunnels and form runways for the cars upon which the green ware to be dried is placed. The cars are omitted from the illustrations. The drier is pro vided with a roof, a stack and suitable doors for the tunnel, all of which are omitted from the illustrations as they may be of any type well known in the art and, therefore, form no part of the present invention. As hereinbefore stated, the invention relates particularly to the furnace and as the furnaces are all identical only one will be described.

Mounted at one end of the tunnel formed by two of the walls 11 is a furnace consist mental. in increasing the heat in the combustion chamber, and is gas tired from ports provided by one or more burners 21. The burners 21 discharge into the furnace and are mounted in the front wall 16. They receive gas from vertical ducts 22 in the front wall which at their lower ends connect with a cross duct 93 at the bottom of the front we. ll. The cross duct 93 receives gas from a tunnel 2-1 through a passageway 25, shown in broken lines, Fig. 1. The opening of the passageway from the tunnel 2- is con trolled by a valve 26 provided with a valve rod 27 which extends out of the tunnel and connects with a rope or cable 29 by means of which the valve is manipulated. The tunnel 2-1- receives gas from any suitable source such as a gas-producer (not shown). The air for supporting combustion of the gas in the furnace is pie-heated and is supplied through a port 30 in the front wall 16. The port 30 is at the end of a lower air duct 31 formed by a tube 32 which is rectangular in cross-section. At the rear of the furnace, the lower air duct 31 communicates with an upper air duct 33 formed by a tube 31 also rectangular in cross-section. The forward end of the upper air duct 33 discharges into a pocket 35 in the inner face of the front wall 16. The pocket 35 extends around the tube or tubes 21 thereby permitting the air to be mixed with the gas as it is discharged therefrom. The tubes 32 and 34 which form the air ducts lie between the burner tubes 21 and the checker work 20, thereby permitting some of the heat of the furnace to be absorbed by the air passing through tubes 32 and Owing to the air for supporting the combustion of the gases being preheated, the combustion will be highly efficient, thereby securing a maximum amount of heat from a minimum of fuel. The gas may be ignited through one or more ports 47 in the upper front wall, see Figs. land 10.

The products of combustion or the burned gases leave the furnace and enter a fine 36 which extends throughout the remaining length of the tunnel and lies immediately below the tracks 13. The said flue consists of a floor 37, side walls 38 and a top 39. The radiation from the walls and top of said flue elevates the temperature of theair in the tunnel thereby thoroughly drying the green ware in said tunnel. To provide for a circulation of air within the tunnel, the front wall 16 is equipped with side ports 40 which communicate with passageways 41 lying between the division walls 11 and the furnace walls 14. The passageways 41 are provided with baffies 42 which are instrumental in circulating the air' in the passageways 41,

whereby said air may extract a maximum amount of heat from the side walls of the furnace. The passageways 41 discharge into the tunnel below the tracks and at the rear of the furnace, as will be seen from Fig. 2. The radiation from the top 15 of the furnace is absorbed by air which enters a chamber 43 through ports 44 in the front wall 16, see Figs. 2 and 10. The chamber 43 is formed by the top 15 and a battle shelf 45 and discharges into the tunnel through a port 46. When the burned gases in the flue 36 and the air in the tunnel reach the end of the drier opposite the furnace, they are received by a stack (not shown).

The fuel. is automatically regulated by means of a thermostatic device as follows: Mounted in each of the ducts 22 is a valve 48 which is mounted on a shaft 49. The shaft 49 is provided with a crank 50 connected to a rod 51 provided with an adjustment 56. The rod 51 is also connected to a lever 52 mounted in the tunnel and fulcrumed on a rod 53 mounted in the walls 11. The lever 52 is actuated by a thermostat-consisting of a metal rod 54 preferably of cop- 'per, which extends down into the furnace through the roof 15 thereof. The rod 54 may be protected from the intense heat of the furnace by a tube The expansion of the rod 54 will rock the lever 52 to close the valves 48, and the lever is so balanced, that when the rod 54 contracts the valves 48 will close. The arrangement is such that when the temperature of the furnace is elevated the supply of gas is diminished and vice versa, thereby maintaining a constant heat to the rear of the furnace and thence to the.

front of the furnace whereby air is introduced through the front wall of the furnace to the burner and the pocket surrounding the burner.

2. In a furnace of the type specified, the

combination with a front wall having a vertical gas passage, and a horizontal air pocket in the inner face thereof, of a burner tube set in an opening in said front wall and communicating with the top of said gas passage, said burner tube lying within said air pocket, an ignition port in the front wall above said burner tube, and air ducts extending one above the other from the front wall to said air pocket.

3. A furnace for driers, consisting of a floor, side walls, front and rear end walls and a top, said front wall having a pocket in its inner face, a burner tube mounted in said front wall and extending into said furnace through said pocket, upper and lower communicating air passages extending longitudinally through the furnace and connecting said pocket with the atmosphere through the front wall, and checkerwork mounted in said furnace on each side of said air passages.

In testimony whereof we affix our signatures, in presence of two witnesses.

GEORGE M. RAYMOND. GEORGE R. MUMMA. l/Vitnesses MnLLin GALLOWAY, MATTHEW SIEBLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

